3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $one = 'cool'; $two = null; $result = $one ?? $two; var_dump($result);
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(4) "cool"
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/VqTeP on line 5
Process exited with code 255.